feat: support async solve functions

Author: mfulton26

bin/aoc.ts

@@ -135,7 +135,7 @@ async function solve(
     console.log(gray(`running solve from ${moduleName}`));
     try {
       const start = performance.now();
-      const answer = solve(input);
+      const answer = await solve(input);
       const end = performance.now();
       const duration = end - start;
       console.log(

lib/harness.ts

@@ -3,7 +3,8 @@ import DotLetters from "@lib/DotLetters.ts";
 export async function getSolveFn(moduleName: string) {
   try {
     const { default: solve } = await import(moduleName);
-    if (typeof solve === "function") return solve as (input: string) => unknown;
+    if (typeof solve !== "function") return;
+    return solve as (input: string) => unknown | PromiseLike<unknown>;
   } catch (e) {
     console.warn(e);
     return;

www/solver.ts

@@ -56,7 +56,7 @@ async function solvePart(
     }
     console.time("duration");
     try {
-      const answer = solve(input);
+      const answer = await solve(input);
       console.log("answer:", formatAnswer(answer, { dotLetterParsing }));
     } catch (e) {
       console.error(e);